Refrigerant evaporator



Sept. 17, 1946.

G. R. GOLDSMITH REFRIGERANT EVAPORATOR Filed March 1, 1944 2 Sheets-Sheet .1

. P W46 ca. R. GOLDSMITH 2,407Q827 REFRIGERANT EVAPORATOR Filed March 1, 1944 2 Sheets-Sheet 2 @0 8 a aozaamim Patented Sept. 17, 1946 REFRIGERAN T EVAPORATOR George Raymond Goldsmith, Girraween Grove, Ashgrove, Brisbane, Queensland, Australia Application March 1, 1944, Serial No. 524,604 In Australia May 13, 1943 6 Claims.

This invention relates to refrigerators of the absorption type, and more particularly to small low temperature chambers within the main refrigerators, said small chambers being used principally for the making ofice-blocks and such like purposes where the descent in temperature should be as rapid as possible, and the temperature is normally considerably lower than that of the refrigerator proper. Such low temperature chambers have been a feature of refrigerators for many years and the difference in conductivity of metals has been the means whereby these small chambers have been rapidly lowered in temperature and maintained at low temperature while the refrigerator proper has beennormally maintained at a higher temperature sufficient for the storage of foodstuffs and the like. Usually an iron evaporating pipe enclosed in a box is provided with a door and made up of metal having a higher heat conductive capacity, the shelving within the box being also of a metal having a higher conductive capacity, such as copper or aluminium. The ice trays are placed upon the shelves within the said box.

.The object of this invention is to provide means whereby a low temperature chamber may be manufactured with a minimum number of standardised sections, which may be rapidly assembled and built into the refrigerator proper, providing a chamber having the qualities required.

The nature of the invention will be fully understood from the following description taken in connection with the accompanying drawings wherein:

Figures 1 and 2 are respectively front and side elevations of a low temperature chamber;

Figures 3, 4 and 5 are detail views of the evaporator pipe with parts of the assembly in position;

Figure 6 is an enlarged vertical sectional detail view of one shelf and associated parts;

Figure 7 is an enlarged vertical sectional detail view of a modified half-sleeve for supporting a frontand .top flanges la and lb. 2 denotes the half-sleeves provided with flanges 3 by which the said half-sleeves 2 are spot-welded, soldered, sweated or riveted to the sides I. The evaporator pipe is designated by reference character 4. Longitudinal channelled fins 5 are formed upon half-sleeves 2. In Figure 6 the half-sleeves 2, flanges 3 and fins 5 are an integral casting or extrusion, whereas in Figure 7 the same parts are formed by pressing sheet metal. Reference numeral 6 denotes a shelf (see Figures 10, l1 and 12) which is rectangular with its end 6a bent up at right angles, and provided with slots 6b and with chamfered corners 6c. Liners 1 (see Figures 8 and 9) are also provided. 8 denotes the front cover plates (see Figures 13 and 14). A top plate 9 is provided with turned side edge 9a adapted to snugly enclose the flanges lb of sides i. A door It] is mounted on the face plate Ilia. ll denotes the ammonia pipe, and I2 the gas heat exchanger.

According to the invention the evaporator pipe 4 is made up of a series of parallel U-shaped sections or turns lying one above the other connected by curved junctions at their ends, except one upper and one lower end which ends are connected to the ammonia pipes. A liquid refrigerant, for example ammonia, is passed through the pipe 4 as is usual practice. The junctions are made by curving downwardly an end of each section, so that it may be welded or otherwise'secured to the adjacent end of a section immediately beneath it. Obviously the junctions of the sections are alternatively disposed at opposite ends of the section as they descend so that .there will be a continuous passage for the gas, and so that the inlet end of the uppermost section will be slightly higher than its other end, and so that as the sections descend that end connected to the curved junction from above will be higher than its downward curved end to provide a continuously descending passage to the heat exchanger l2.

The box upon the outside of and enclosing the exaporator pipe t consists of two side plates I having inturned flanges Ic at one end to form a back, and having outwardly extending flanges to at the front, which sides and back are adapted to lie closely adjacent the outside walls of the pipe sections 4. Flanges lbare also provided on the upper edges of the side plates 1 adapted to be accommodated in the downwardly and inward- 1y turned edges 9a of top 9 and make a tight sliding fit therewith. The two pieces of sheet metal I forming the sides and back of the box are sethan others to compensate for the difference in,

level of the twosides of the pipe sections, so that when shelves 6 are mounted with their opposite edges in channels formed in fins they will be horizontal. These shelves have Vertical rear portions 6a recessed at 62'), and chamfered at 60, the

recesses 6b being to avoid the fins 5 on which the 2. In a refrigerator of the absorption type having an evaporating coil in the form of a plurality of substantially horizontally disposed U-shaped turns, said turns being arranged in superimposed vertically spaced relation with corresponding portions of the several turns in vertical alignment,,a..low temperature, cooling chamber consisting of thinjrnetal outer'sides and, back positioned about said coil, U-shaped half sleeves surrounding opposite legs of the coil turns and secured to said sides, fins on said sleeves extending inwardly between the opposite legs of the coil turns, and shelves slidably mounted upon said fins.

3. In a refrigerator of the absorption type having an evaporating coil in the form of a plural- Each upturned portion to forms a part ofthe (see Figures 8 and 9) aremoved rearwardly until their rear ends are between the side edges of the upturned ends 6a of shelves 6 and half-sleeves 2 and form the sides of compartments between the shelves ii. When the shelves '5 and liners l have been located, right angled cover plates 3 are mounted over the forward ends ofthe liners 7 and secured by studs 8a to the flanges Id of the sides I (see Figure 3). A flanged face plate led to which door It is also hinged is secured by studs 8a around the open framework 'of the box' as shown in Figures 1 and 2. A modified form of half-sleeve formed of sheetmetalis shown in Fig. 15, partssimilar to the parts of half-sleeve 2, being designated by the same reference numerals with subscripts.

In a further modification shown in Fig. 15, the

fins 5a of half-sleeve 2a may be thin and unchan-- nelled in which case the shelves 6d could be pro 1. In a refrigerator of the absorption type,

having an evapo-ratingcoil in the form of a plurality of substantially horizontally disposed U- shaped turns, said turns being arranged in superimposed vertically spaced relation with correspondingportions of the several turns-in verti cal alignment, a low temperature cooling chamber consisting of thin metal outer sides having front flanges and back held to the turns of the evaporator coil by flanged half-sleeves passing around said turns; longitudinal channelled finsupon said half-sleeves; shelves with upturned rear ends for forming sections of the rear inner wall, the side edges of said shelves being slidable in the channels of the fins, and provided with chamfers and slots for avoidance of obstacles; liners for location between the upturned ends of said shelves and the half-sleeves on the one hand, and behind right angled cover plates secured to the front flanges on the outer sides on the other hand; flanges on the tops of "said sides, a top withinturned side edges for sliding along the flanges onthe tops of said'sides; a-face plate secured upon said cover plates, and a door hinged to said face plate.

-ity "of substantially horizontally disposed U- shapedturns, said turns being arranged in superposed vertically spaced relation with corresponding portions of the several turns in vertical alignment, a low temperature coolingchamber consisting of thin metal outer sides and back posi tionedabout said coil, U-shaped half sleevessur rounding opposite legs of the coil turnsandsecured to said sides, channeled fins on said sleeves extending inwardly between the opposite legs of the coil turns, and shelves slidably mounted in said channels. 7 7

4; In a refrigerator of the absorption-type having an evaporating coil'in the form of a plurality of substantially horizontally disposed U shaped' turns, said turns being arranged in superim posed vertically spaced relation with correspond-' ing portions of the several turnsin vertical alignment, a low temperature cooling chamber consisting of thin metal outer sides and back posi tioned about aid coil,- U-shapedhalf sleeves 5. In a refrigerator of the absorption type having an evaporating coil in the form of a plurality of substantially horizontallydisposed U-shaped turns, said turnsbeing arranged in superimposed vertically spaced relation with corresponding portions of the several turns in vertical alignment, a low temperature cooling chamber con sisting of thin metal outer sides and'back posi-- Z coil turns, and shelves slida-bly mo-unted'upo'risaid fins and having channels to receive said fins.

6. In a refrigerator of the 'abso-rptiontype-having an evaporating coil in the form of a plurality of substantially horizontally disposed u shaped turns, said turns being arranged in superimposed verticallyspaced relation withcorresponding portions of the several turnin vertical align-"- ment, a low temperature cooling chamber con-- sisting of thin metal outer sides and back positioned about said coil, surrounding opposite legs of the coil turns and secured to said sides, fins on said sleeves eXtend-= ing inwardly between the opposite legs of the coil turns, and shelves slidably mounted -up'on said fins and having upturned rear-portions GEORGE RAYMOND GOLDSMITH. 91

U-shaped half sleeves 

